<template>
  <!-- 排序区域 -->
  <div class="list-container">
    <!-- 排序区域 -->
    <div class="sub-sort">
      <div class="sort">
        <a
          :class="{ active: sortParams.sortField === null }"
          @click="changeSort(null)"
          href="javascript:;"
          >默认排序</a
        >
        <a
          :class="{ active: sortParams.sortField === 'publishTime' }"
          @click="changeSort('publishTime')"
          href="javascript:;"
          >最新商品</a
        >
        <a
          :class="{ active: sortParams.sortField === 'orderNum' }"
          @click="changeSort('orderNum')"
          href="javascript:;"
          >最高人气</a
        >
        <a
          :class="{ active: sortParams.sortField === 'evaluateNum' }"
          @click="changeSort('evaluateNum')"
          href="javascript:;"
          >评论最多</a
        >

        <a @click="changeSort('price')" href="javascript:;"
          >价格
          <i
            class="arrow up"
            :class="{
              active:
                sortParams.sortField === 'price' &&
                sortParams.sortMethod == 'asc',
            }"
          />
          <i
            class="arrow down"
            :class="{
              active:
                sortParams.sortField === 'price' &&
                sortParams.sortMethod == 'desc',
            }"
          />
        </a>
        <div class="check">
          <XtxCheckbox v-model="sortParams.inventory"
            >仅显示有货商品</XtxCheckbox
          >
          <XtxCheckbox v-model="sortParams.onlyDiscount"
            >仅显示特惠商品</XtxCheckbox
          >
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { reactive, watch } from 'vue'
export default {
  name: 'SubSort',
  setup (props, { emit }) {
    const sortParams = reactive({
      inventory: false, // 仅有货
      onlyDiscount: false, // 仅特惠
      sortField: null, // 排序字段：publishTime最新商品,orderNum最高人气,evaluateNum评论最多,price价格
      sortMethod: 'desc' // asc正序或 desc倒序
    })
    const changeSort = type => {
      sortParams.sortField = type
      if (sortParams.sortField === 'price') {
        if (sortParams.sortMethod === null) {
          // 第一次点击，默认是降序
          sortParams.sortMethod = 'desc'
        } else {
          // 不是第一次点击：当前排序取反
          sortParams.sortMethod = sortParams.sortMethod === 'desc' ? 'asc' : 'desc'
        }
      } else {
        // 如果排序未改变停止逻辑
        sortParams.sortMethod = 'desc'
      }
    }
    watch(sortParams, () => {
      emit('sort-change', sortParams)
    })

    return { sortParams, changeSort }
  }
}
</script>
<style scoped lang='less'>
.sub-sort {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  .sort {
    display: flex;
    a {
      height: 30px;
      line-height: 28px;
      border: 1px solid #e4e4e4;
      padding: 0 20px;
      margin-right: 20px;
      color: #999;
      border-radius: 2px;
      position: relative;
      transition: all 0.3s;
      &.active {
        background: @xtxColor;
        border-color: @xtxColor;
        color: #fff;
      }
      .arrow {
        position: absolute;
        border: 5px solid transparent;
        right: 8px;
        &.up {
          top: 3px;
          border-bottom-color: #bbb;
          &.active {
            border-bottom-color: @xtxColor;
          }
        }
        &.down {
          top: 15px;
          border-top-color: #bbb;
          &.active {
            border-top-color: @xtxColor;
          }
        }
      }
    }
  }
  .check {
    .xtx-checkbox {
      margin-left: 20px;
      color: #999;
    }
  }
}
</style>
